excel calculation guru.

I am looking for a freelance with high attention to detail. The purpose is to create an excel interest calculation schedule. There are 13 loans. The current schedules are very messy and we need to recalculate and and present in the perfect design. the recalculations should have the same result as the original, but if there are errors in the orginal we just need to highlight the cell and mention the error we think. Project require on Monday complete. Very good in excel is a MUST.